Shaper attachment for lathes



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l SHAPER ATTACHMENT Foa LATHEs Filed oct. 27, 1952 4 sheertssheet a Mpfaaf?,

Sept. 14, 1954 H. L.. HAGER 2,688,903

SHAPER ATTACHMENT FOR LATHEs' Filed oct. 27, 1952 4 Sheets-Sheet 4 TEU@rP-j r/h ro l n INVENTOR.

T T WM r M" Patented Sept. 14, 1954 UNITED STATES PATENT OFFICE SHAPERATTACHMENT Fon LATHES lHarve L. Hager, Oakland, Calif.

Application October 2'7, 1952, Serial No. 317,204? i 3 Claims.

The present vinvention relates toa shaper attachment for a lathe b-ymeans of which work normally done on a shaper or milling machine may beperformed on a lathe. Thus the attachment is adapted t0 be utilized onhousehold lathes andin small plants, where regular shapers would beprohibitive. It consists of the combinations, constructions, andarrangement of parts, as hereinafter described and claimed.

An object 'of Vmy invention is 'to provide a reciprocating ram having 'a`tool-carrying clapper box mounted thereon, the Vram `being made forattachment 'to a lathe bed and being adapted to be moved back andforthby a wobble plate, the latter being actuated `by a rotating tureswill be set 'forth in the claims hereunto appended.

Drawings .For a better understanding of the invention, reference shouldbe vhad to the accompanying drawings, in which:

Figure l is a front elevational view of a conventional lathe having myattachment secured thereto;

Figure 2l is an enlarged transverse sectional view taken along thevertical plane II-II of rieure 1: Y,

Figure 3 is an elevational view of vmy attachment on .a larger scalethan in Figure'hparts being shown in section;

Figure 4 -is a horizontal sectional view taken through the Wobbleplate,along the line IV-IV of Figure;

Figure 5 is a transverse sectional view taken along the vertical planeV--V of Figure 3, illustrating the reciprocating ram and its guidesupport;

Fig-um 6 Vis a-'top plan view .of Figure 3,;

Figure 7 is a. fragmentary view disclosing the A 2 wobbleplate'adjuste'dinto angular position relative to the axis vof the headstock spindle;

Figure Sis a perspective view of a spring fork for yieldingly holdingtheclapper box in its normal position;

Figure 9` is a vertical transverse sectional View taken along the lineIX-IX of Figure 3, disclosing the arrangement for clamping theramguiding support to the'lathe bed;

AFigure 10 is a yfront Velevational view of the clapper box during thereturn stroke;

Figure l1 is a ltransverse sectional View taken aiong the vertical planeX-I--XI of Figure 3. showing the viseholding a w'orkpieceiin operativerelation with respect Ito the tool `carried by the clapper box; and

Figure 12 is an end elevational view of the clapper box adjusted intoangular 1position so that its tool will cut vinclined surfaces.

While I have `shownonl'y the preferred form of my invention, it'shouldbe understood that various changes, ormodifications,fmay be made withinthe scope'of the annexed claims without departing fromthe spiritthereof.

Detailed description For the purpose of illustration, .I have shown aconventional 'lathe' indicated generally at A having parallel waysvIll-It) extending length- Wise thereof, along which an adjustablecarriage B is movable. Theheadstock and tailstock are designated at andD, respectively. Upon this carriage'there vis mounted the crossfeed E inthe ordinary manner. Within the headstock the `usual tubular spindle Fis journailed yfor rotation, this spindle being turned by a drivemechanism accommodated in a housing I I (see-Figures l and 3).

With this'backgrou'nd in mind, I make use of a tapered shank G, which isinsertable into the spindle F so as to be rotated by the latter. Thisshank has a spherical head I2 at its outer end, and the head is,fashioned with a slot I4 to re.- ceivean eye-bolt I5 (see'Figures 1, 3and 4,). "It will be noted-that `this eye-bolt is pivotally secured by`a transverse pin I6 to the spherical head of the shank. The outercnds0i this, ein are slidably received in arcuate flQOves I-l-lj'l fashionedin an inner race I8 of a wobble `plate H surrounding the head I2,Moreover, a washer I9 and nut 20 are mounted on the eye-bolt and holdthe inner race I8 in-place. Anouter race 2| is mounted-aroundtheinnerrace I8, with .a ball bearing 22. arranged therebetween.

Referring to Figures 2 and 6, it will be observed that the inner race I8rotates with the tapered shank G, while the outer race 2l is heldagainst rotation by an arm 23 xed to and projecting therefrom. This armis connected by a ball joint 24 to the upper end of a holding link 25,and the latter has its lower end secured by a universal joint 26 andclamp 2 tol one of the ways IU. However, the link 25 permits the wobbleplate I-I to swing into various angular positionsrabout vthetransverse'pin I6, as will be apparent by comparing Figures 3 and 7.

Now the outer race 2l of the wobble plate has a bracket 28 xed to thetop thereof to which a pitman 29 is attached by a universal joint 30. Inturn, the pitman is coupled by a ball joint 3l to a reciprocating ram J,which is slidably mounted for back and forth movement in a guide support32 mounted on an adjustable standard 33.

In reality the ram J includes a horizontallydisposed slide 34 to which abracket 35 is adjustably secured, the ball joint 3l being fastened tothis bracket. For permitting the slide 34 to be extended or retractedrelative to the bracket 35, the former is provided with clamping studs36 that pass through slots 31 fashioned in the sides of the latter.

Reference is made toFigures l, 3, 6 and 9, wherein it will beapparentthat the lower end of the standard 33,has a base 38 arranged to over-1ie` portions of the lathe bed ways Ill- IU so as to be adjustabletherealong. This base coacts with a clamping bar 39, which underliesportion of these ways as shown in Figure 9. Studs 40 are provided fordrawing the bar 39 toward the base 38 to thereby clamp the standard 33in adjusted position.

As shown in the drawings, the workpiece K to be cut by my Shaperattachment is supported in a vise L mounted on the cross-feed E, withthis workpiece being arranged beneath a clapper box M, which `is pivotedby a pin 4l to the forward end of the reciprocating ram J This clapperbox is standard in construction,

and includes a vertically-adjustable rod 42 having a cutting tool 43mounted on the lower part thereof. Also, the clapper box may be swunginto angular positions relative to the ram J, as suggested in Figure 12,and locked in these positions by a stud 44, thereby permitting inclinedsurfaces 45 to be cut by the tool.

v At the top of the rodI 42 there is provided an adjusting nut 45 havingan annular groove 47 formed therein to Vreceivethe lingers 48 of abifurcated fork N (see Figures 6 and 8). The reciprocating ram J, whenmoving to the right in Figure 3, will cause the tool ,43 to cut materialfrom the workpiece K. On return stroke of the pitman 29 and the ram, theclapper box will swing about its pivot 4i against the action of a spring49 interposed between the fork N and a lug 55 provided on anupstandingportion of the ram slide 34. When the ram starts a forward stroke, thisspring will return the 'elapper box to its normal upright position, thusrestoring the tool 43 toits cutting engagement with the workpiece.

In operation, the wobble plate H may be adjusted-so as to furnish thedesired stroke to the pitman -29 and its ram J during rotation of theshank G. This adjustment isA obtained by anchoring a head 5i to theshank with a pin 52, and then providing a threaded stud 53 on this headhaving a presser shoe 54 bearing against the rear face of the wobbleplate. Adjustment of the stud 53 will result lin swinging the wobbleplate into angular positions relativeto the longitudinal axis of theshank G, thereby varying the stroke of the ram.

Summary chored to the tubular spindle F of the headstock` C, and thestandard 33 is,l secur'edupon the ways Ill-lil ofy the lathe bed'by-theclamping bar 39. Furthermore, the stud 53 is adjusted so as to impartthe desired stroke to the pitman 29 and the reciprocating ram J when thewobble plate H is turned by the rotating shank G. Also, the slide 34 andbracket 35 may be adjusted relative to one another.

` Next, the workpiece K is clamped in the vise L, and the clapper box Madjusted so that its tool 43 will cut material from the workpiece to thedesired depth. In the event that inclined surfaces 45 are to be cut, assuggested in Figure 12, the clapper box is adjusted into the necessaryslanting position. l

As the wobble plate H is rotated, the pitman 29 will cause Vthe ram J tobe' reciprocated back and forth in the guide support 32, ,with the tool43 lcutting on its forward strokes and dragging lightly back over thevworkpiece on the return strokes, As the cutting progresses,thecrossfeed E may be moved to bring new surfaces of the workpiecebeneath the cutting tool.

Thus vmy attachment will permit a lathe to be employed for performingthe operations of `a Shaper, all with a relatively simple mechanism. Itwill be noted fromv the plan view shown in Figure 6 that the carriage Bis substantially H- shaped, and that the ram lsupport 33 and its base 38are nested in one of the recesses of this carriage for better work andtool positioning.

1. In a Shaper attachment for a lathe: a shank adapted to be secured toa rotatable spindle in the headstock of a lathe; a wobble plateincluding an inner race pivotally attached toy the shank to turntherewith, andan outer racevsurrounding the inner race; vmeans for'adjusting the wobble plate into angularinclined positions relative tothe axis of the shank; means for retaining the outer race againstrotating about said axis; a pitman attached to the outerA race of thewobble plate so as to be reciprocated back and forth when the wobbleplate occupies an inclined position with respect to the shank; a ramconnected to the pitman for reciprocation by the latter; a guide supportadapted to be secured to the lathe, and having the ram mounted thereinfor back and forth movement; a'clapper box carried by the ram, andhaving a cutting tool carried thereby; and means for adjusting the guidesupport longitudinally of the lathe.

2. In a Shaper attachment fora lathe: a shank adapted to be secured to arotatable spindle in the headstock of a lathe; a wobble plate includingan inner race pivotally attached to the shank to turn therewith, and anouter race surrounding the inner race; means for adjusting the wobbleplate into angular inclined positions relative to the axis of the shank;means forfretaining the outer race against rotating about said axis; apitman attached to the outer race of the wobble plate so as to bereciprocated back and forth when the wobble plate occupies an inclinedposition with respect to the shank; a ram having a bracket connected tothe pitman for reciprocation by the latter; the ram further having a.slide adjustably secured to this bracket so as to be extendible orretractable relative to the bracket; a guide support adapted to besecured to the lathe, and having the ram slide mounted therein for backand forth movement; and a clapper box carried by the slide of the ram,and having a cutting tool carried thereby.

3. In a shaper attachment for a lathe: a shank adapted to be secured toa rotatable spindle in the headstock of a lathe; a wobble plateincluding an inner race pivotally attached to the shank to turntherewith, and an outer race surrounding the inner race; means foradjusting the wobble plate into angular inclined positions relative tothe axis of the shank; an arm iixed to the outer race to projecttherefrom; a link having one end thereof universally connected to thisarm, and its other end universally attached to a clamp; the latter beingmade for clamping upon a. way

of the lathe; a. pitman attached to the outer race of the wobble plateso as to be reciprocated back and forth when the wobble plate occupiesan inclined position with respect to the shank; a ram connected to thepitman for reciprocation by the latter; a guide support adapted to besecured to the lathe, and having the ram mounted therein for back andforth movement; and a clapper box carried by the ram, and having acutting tool carried thereby.

References Cited in the Ille of this patent UNITED STATES PATENTS NumberName Date r190,259 Mills May 16, 1905 1,679,884 Thomas Aug. '7, 19282,431,230 Cooper Nov. 18, 1947 2,639,620 Bamford May 26, 1953

